Standard 2: Students will understand that the features of Earth’s evolving environment affect living systems, and that life on Earth is unique in the solar system.

Objective 1: Describe the unique physical features of Earth’s environment that make life on Earth possible.
a. Compare Earth’s atmosphere, solar energy, and water to those of other planets and moons in the solar system.
b. Compare the conditions that currently support life on Earth to the conditions that exist on other planets in the solar system.
c. Evaluate evidence for existence of life in other star systems, planets, or moons, either now or in the past.